This 8 inch Stoltz Keel Roller Bracket Assembly will replace your rusted or worn keel roller on your boat trailer. Stoltz Brand Keel Rollers are the best boat trailer keel rollers on the market, guaranteed to outlast any other roller money can buy. Typically these are located along the center line of your boat trailer. We have put all the needed items together into a kit that does not come assembled. This kit includes an 8 inch Polyurethane Stoltz Brand rubber Keel Roller, a 9 1/2 inch 5/8 inch diameter Stainless Steel Roller Shaft, an 8 inch Galvanized Roller Bracket, and (2) 5/8 diameter Pal Nut Caps. You can view what this assembly will look like mounted, by looking at the sample photo with this listing. This kit will either be an exact replacement for what is on your trailer, or you may be adding keel rollers to your trailer. The purpose of this kit is to provide support, protection, and a more efficient method of loading and unloading your boat. Typically they will mount on your forward most cross member, and sometimes on your other cross members.